Advanced Materials Research Vols. 753-755

Abstract: This paper presents the model of capacitive RF-MEMS switch for the lifetime prediction. The model is based on dielectric charging failure mechanism. The simulation results show that lifetime can reach 1000 hours when elastic coefficient (K) adopts 4-16N/m, Si₃N₄ as dielectric material, 0.4-1μm of dielectric thickness, 2-5μm of plate distance, less than 20V of driven voltage.

Abstract: A new method for electronic circuit fault knowledge automatic generation Using PSpice has been put forward based on summarizing development of the intelligent fault diagnosis technology. A new algorithm of generating fault knowledge automatically has been designed by analysing the structure characteristics of the CIR file. The algorithm of search automatically has been designed by analysing the structure characteristic of the OUT file. The DC fault dictionary method has been improved and the fault order according to the minimum distance will guide the user to remove the fault. In the end, through these technologies, the fault knowledge query system has been empoldered. The feasibility of the proposed method has been proved by experiment results.

Abstract: Au stud bump can provide a good heat spreading path for the flip-chip LED due to its high thermal conductivity (300 W/mK) . In this paper, we compared four flip-chip LED devices with four different numbers of Au stud bumps. The thermal imaging analysis indicates that the heat dissipation is proportional to the number of Au stud bump. However, when the number of Au stud bumps was larger than 24, the heat dissipation performance will become deteriorated due to the poor bonding between grain and substrate. Therefore, the number of Au stud bumps was optimized to be 20 to 24, which can be employed to develop flip-chip LEDs with optimum electrical and optical performance.

Abstract: Efficient white organic light-emitting diodes are fabricated with the blue and green fluorescent incorporating red phosphorescent emitting layer. The blue, green and red emitting layer consist of 1,4-bis (2,2-diphenyl vinyl) benzene (DPVBi), tris (8-hydroxyquinoline) aluminium (Alq) and the bis (1-(phenyl) isoquinoline) iridium (III) acetylanetonate [Ir (piq)₂(acac)] doped into 4,4(-N,N)-dicarbazole-biphenyl (CBP) host, respectively. The devices were made of ITO/ m-MTDATA (40 nm)/ NPB (10 nm) /DPVBi (8 nm)/ CBP: Ir (piq)₂(acac) x% 5nm/ Alq (50 nm )/ LiF (1 nm) / Al (200 nm). The electroluminescent (EL) spectra exhibit three peaks at 456, 520 and 620 nm, resulting in white light-emission with the Commission Internationale dEclairage (CIE) chromaticity coordinates of (0.37, 0.44) at 4V to (0.23, 0.30) at 13V when x is 4, while the device shows the current efficiency of 4.0 cd/A at 6V, and its maximum luminance is 21660 cd/m² at 13V, respectively.

Abstract: Reviewing and analyzing insulation mechanism of high voltage wall bushing, the structure of 1100kV UHVDC wall bushing and its key technical parameters are designed according to work conditions. Insulation structure and electric field of key bushing parts are simulated by ANSYS11.0. And the solution is optimized by SubProblem method based on the DC field theory. The result indicated that the parameters of designed solution could meet the needs of 1100kV UHVDC power transmission project.

Abstract: Traditional lighting control gradually replaced by the intelligent lighting control. Based on Neuron chip tuning optical touch screen is based on the experimental platform to design and develop. This paper introduces how to apply Lon-works technology to develop the project's main technical process and the design method of software and hardware,including the necessary interface circuit and control program. It has been run and debug experiment, be good for lighting control and realized remote control.

Abstract: A high reliability, flexible reactive power automatic compensation controller based on PLC is designed, which the structure and principle of the system is explicitly specified. The controller adopts commercial PLC as the control core,TD400C as human-machine interface, and uses ABB RVT-6 power factor controller to control the switching of the capacitor. Blocking structure is used to design software, whose structure is clear and easy to debug and modify. Running result obtained from relevant application describing the novelty of reactive power compensators implemented with new technologies is also described.

Abstract: To meet the special requirements of battlefield, a 4×4 hybrid electric drive scheme based on 1-ton military wheel vehicle is proposed, it consists of engine-generator sets, electric power converter, battery and AC (alternate current) motors, and the corresponding matching calculation of its main components is implemented in this paper. On this basis, a distributed electric drive control system based on CAN bus network is also developed. The control system not only realizes electric differential function when vehicle is steering, but also provides with three different kinds of driving modes. Experiment results of prototype vehicle prove that what studied in this paper not only satisfy requirement such as strong mobility and multi-function, but also be reliable.

Abstract: A digital computer may serve as a compensator or a controller in a feedback control system. We may use the z'-transform of a transfer function to analyze the stability and transient response of a system. Thus, we may readily determine the response of a closed-loop feedback system with a digital computer serving as the compensator (or controller) block.

Abstract: According to current technological situation that most of the existing Modbus networks are based on cable and the disadvantages of cable in bus architecture such as troubles during installation, much inconvenience in maintenance debugging and the potential safety hazard following high non-isolated, a design proposal based on Modbus digital transmission module is presented to realize the communication function without cable. During the design proposal, a wireless RF A7108 chip offered by SHENGKE electronic company is selected as the transmission carrier, which is followed by the transmit-receive pattern of Modbus protocol. And the transmission reliability of wireless data is guaranteed by the CRC check of every frame in the process of data transmission. This design can improve the problem of cable dependence in the traditional bus system and has a certain practical value within 500 meters radius in the industry with cable arrangement difficulty.